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Introduction

The 1999-2004 Jeep Grand Cherokee has a common failure where the blower fan wire adapter overheats and melts. Use this guide to fix and repair this connector and get your AC and Heater working again!

  1. Place the vehicle in park, activate the parking brake, and leave the car running. The blower motor is located under the dash on the passenger side of the vehicle. For easier access to the wiring push the seat back, and place your tools on the floor of the car .
    • Place the vehicle in park, activate the parking brake, and leave the car running.

    • The blower motor is located under the dash on the passenger side of the vehicle.

    • For easier access to the wiring push the seat back, and place your tools on the floor of the car .

  2. The blower motor adapter is a bundle of three wires located on the left side. While the vehicle's ignition is on, push and pull gently on the wire connection.
    • The blower motor adapter is a bundle of three wires located on the left side.

    • While the vehicle's ignition is on, push and pull gently on the wire connection.

    • If the blower motor turns on, you have identified the problem and following this guide will help you fix it

    • If the fan does not turn on, the damage may not be fixable without purchasing new parts.

    • For your safety do not grasp any wires you can not see. Do not attempt to grasp any wires that are not covered in insulation and/or electrical tape.

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  4. Turn off the ignition on the vehicle and proceed with the following steps. There are two screws holding the adapter in place. Using a Phillips head screwdriver, remove both screws in order to remove and gain access to the adapter. The two screws are identical. Be careful not to lose them.
    • Turn off the ignition on the vehicle and proceed with the following steps.

    • There are two screws holding the adapter in place. Using a Phillips head screwdriver, remove both screws in order to remove and gain access to the adapter.

    • The two screws are identical. Be careful not to lose them.

    • Be sure the car is completely off before unscrewing anything.

  5. The fault typically occurs at the connection between the three wires and the adapter box. Observe the damage and decide if electrical tape will be enough to hold the wires in place.
    • The fault typically occurs at the connection between the three wires and the adapter box.

    • Observe the damage and decide if electrical tape will be enough to hold the wires in place.

    • If so, using electrical tape, wrap the wires tightly until they are securely in place.

    • Replacement parts are available for purchase if the damage is beyond your repair capabilities.

  6. Screw the adapter back into place. Turn on the car and test the AC/Heater to make sure it works. Turn on the car and test the AC/Heater to make sure it works.
    • Screw the adapter back into place.

    • Turn on the car and test the AC/Heater to make sure it works.

Conclusion

Enjoy your working AC and Heater!

6 other people completed this guide.

William Schaller

Member since: 02/24/2015

347 Reputation

1 Guide authored

Team

Cal Poly, Team 24-1, Green Winter 2015 Member of Cal Poly, Team 24-1, Green Winter 2015

CPSU-GREEN-W15S24G1

4 Members

3 Guides authored

5 Comments

radical, thank you for this!

cgerdes714 - Reply

Very good job - thanks for the info

I own one WJ 4.0 m1999

The ac doesn’t turn on(no lights)

Is this loose wire connection responsible for this?

ANGELO - Reply

good job thanks

rad8253 - Reply

Thank you this solved it for me easy simple.thank you

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